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Mass Effect Hints
Find More Valves
1 of 4: After you open the second water valve mentioned in the "Feros: Geth in the Tunnels" hints, go north from the four-way path split.
2 of 4: You'll soon encounter another geth group that you'll have to take down using the usual fire-from-cover tactics.
3 of 4: The third and final water valve is at the south end of the passage where that attack happens.
4 of 4: When you open it, you'll get the "Inform Macha Doyle" objective.
